#include "ManagedBlasProvider.h"

doublereal SmartMathLibrary::Blas::Engine::ManagedBlasProvider::ddot_(integer *n,
  doublereal *dx, integer *incx, doublereal *dy, integer *incy)
{
  /* System generated locals */
  integer i__1;
  doublereal ret_val;
  /* Local variables */
  static integer i__, m, ix, iy, mp1;
  static doublereal dtemp;
  /*  Purpose   
  =======   
  forms the dot product of two vectors.   
  uses unrolled loops for increments equal to one.   
  jack dongarra, linpack, 3/11/78.   
  modified 12/3/93, array(1) declarations changed to array(*)   
  Parameter adjustments */
  --dy;
  --dx;
  /* Function Body */
  ret_val = 0.;
  dtemp = 0.;
  if (*n <= 0)
  {
    return ret_val;
  }
  if (*incx == 1 &&  *incy == 1)
  {
    goto L20;
  }
  /*        code for unequal increments or equal increments   
  not equal to 1 */
  ix = 1;
  iy = 1;
  if (*incx < 0)
  {
    ix = ( - (*n) + 1) **incx + 1;
  }
  if (*incy < 0)
  {
    iy = ( - (*n) + 1) **incy + 1;
  }
  i__1 =  *n;
  for (i__ = 1; i__ <= i__1; ++i__)
  {
    dtemp += dx[ix] *dy[iy];
    ix +=  *incx;
    iy +=  *incy;
    /* L10: */
  }
  ret_val = dtemp;
  return ret_val;
  /*        code for both increments equal to 1   
  clean-up loop */
  L20: m =  *n % 5;
  if (m == 0)
  {
    goto L40;
  }
  i__1 = m;
  for (i__ = 1; i__ <= i__1; ++i__)
  {
    dtemp += dx[i__] *dy[i__];
    /* L30: */
  }
  if (*n < 5)
  {
    goto L60;
  }
  L40: mp1 = m + 1;
  i__1 =  *n;
  for (i__ = mp1; i__ <= i__1; i__ += 5)
  {
    dtemp = dtemp + dx[i__] *dy[i__] + dx[i__ + 1] *dy[i__ + 1] + dx[i__ + 2]
      *dy[i__ + 2] + dx[i__ + 3] *dy[i__ + 3] + dx[i__ + 4] *dy[i__ + 4];
    /* L50: */
  }
  L60: ret_val = dtemp;
  return ret_val;
} /* ddot_ */
